Twitter CFO Anthony Noto announced today that the social network was placing the blame for 4 million lost users squarely on Apple’s shoulders, saying that the company had “lost approximately 4 million net users due to rollouts of iOS 8” during an earnings call.

The logic here, Business Insider explains, is that the Shared Links section in iOS 7’s version of Safari automatically updated to pull in the latest links from a users Twitter feed. In iOS 8 this feature has been shifted to use a manual refresh. As a result, users who were previously counted when their phones checked for those shared links were no longer listed among the service’s monthly active users.

But Twitter wasn’t done playing the blame game just yet. The microblogging service went on to say that as many as 1 million users had upgraded their iPhones and simply forgotten their passwords or failed to reinstall the Twitter app, leading to even fewer active users thanks to Apple.